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Method for manufacturing tube-type fuel cell

a technology of fuel cell and tube, which is applied in the direction of cell components, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of difficult direct formation of functional layers, and achieve the effects of easy removal of steps, good adhesion, and easy removal of steps

Inactive Publication Date: 2010-11-23
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for manufacturing a tube-type fuel cell with good adhesion without blocking the gas flow channel in its inner current collector. This is achieved by forming a removable portion in the gas flow channel and sequentially adding a functional layer such as an inner water-repellent layer and an inner catalytic electrode layer on the removable portion before removing the removable portion. This method allows for the production of fuel cells with high electric generation efficiency. The gas flow channel can be filled with a removable substance, which provides the advantage of selecting the shape of the gas flow channel. The inner current collector can also be designed with an optimized gas flow function and electricity-collecting function. The method is preferably carried out using a liquid-removable substance or a heat-removable substance. The functional layer can be an inner water-repellent layer or an inner catalytic electrode layer. The invention provides the advantage of obtaining a tube-type fuel cell with good adhesion without blocking the gas flow channel in its inner current collector.

Problems solved by technology

For example, in a conventional art, it is difficult to directly form a functional layer such as an inner water-repellent layer and an inner catalytic electrode layer on an inner current collector with a large-width gas flow channel.

Method used

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  • Method for manufacturing tube-type fuel cell
  • Method for manufacturing tube-type fuel cell
  • Method for manufacturing tube-type fuel cell

Examples

Experimental program
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Effect test

example 1

[0082]Powdery polyvinyl alcohol (PVA) was sprayed on the groove portions (gas flow channels) of a cylindrical inner current collector (φ=0.85 mm×180 mm, 0.1 mm grooves) and then dried to form removable portions. An inner water-repellent layer forming-composition containing the same amounts of polytetrafluoroethylene (PTFE) and acetylene black was then applied to the inner current collector and the removable portions so that an inner water-repellent layer was formed. The resulting component was then immersed in water so that the PVA was removed. After the PVA was removed, the gas flow channels were examined. As a result, it was determined that no gas flow channel was blocked.

example 2

[0083]Paraffin was applied to the grooves (gas flow channels) of the same inner current collector as used in Example 1 so that removable portions were formed. An inner water-repellent layer forming-composition containing the same amounts of polytetrafluoroethylene (PTFE) and acetylene black was then applied to the inner current collector and the removable portions so that an inner water-repellent layer was formed. The resulting component was then heated at 150 to 200° C. so that the paraffin was removed. After the paraffin was removed, the gas flow channels were examined. As a result, it was determined that no gas flow channel was blocked.

example 3

[0084]Powdery polyvinyl alcohol (PVA) was sprayed on the groove portions (gas flow channels) of the same inner current collector as used in Example 1 and then dried to form removable portions. Then, an inner water-repellent layer, an inner catalytic electrode layer (15 μm in thickness), a solid electrolyte membrane (45 μm in thickness), an outer catalytic electrode layer (15 μm in thickness), and an outer water-repellent layer were sequentially formed by a spray method, and finally, an outer current collector was placed therearound. The resulting component was then immersed in water so that the PVA was removed. After the PVA was removed, the gas flow channels were examined. As a result, it was determined that no gas flow channel was blocked.

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Abstract

A method for manufacturing a tube-type fuel cell by which a tube-type fuel cell with good adhesion can be produced without blocking a gas flow channel in its inner current collector. The method for manufacturing a tube-type fuel cell may include a filling step of providing a columnar-shaped inner current collector having a gas flow channel on its outer peripheral face and filling the gas flow channel with a removable substance to form a removable portion. Also a functional layer forming step of forming a functional layer on at least the removable portion and a removing step of removing the removable portion after the functional layer forming step may be used.

Description

[0001]This is a 371 national phase application of PCT / JP2006 / 317588 filed 30 Aug. 2006, claiming priority to Japanese Patent Application No. 2005-251352 filed 31 Aug. 2005, the contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a method for manufacturing a tube-type fuel cell by which a tube-type fuel cell with good adhesion can be produced without blocking gas flow channel in its inner current collector.BACKGROUND ART[0003]A unit cell which is a minimum electric generating cell unit of a prior art solid polymer electrolyte type fuel cell having a flat-plate structure (hereinafter referred briefly to “flat-type fuel cell” in some cases) generally has a membrane electrode assembly in which catalytic electrode layers are connected to both sides of a solid electrolyte membrane. Further, gas diffusion layers are disposed on both sides of the membrane electrode assembly. Further, separators each having a gas flow passage are dispo...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B05C1/16H01M8/00H01M4/64H01M4/02H01M8/02H01M8/10
CPCH01M4/8807H01M4/8814H01M4/8821H01M4/8878H01M8/004H01M8/0247H01M8/0258H01M4/8882H01M8/0252H01M8/04171H01M2008/1095Y02E60/522Y02E60/50Y02P70/50H01M8/0267H01M8/026
Inventor NAKANISHI, HARUYUKIMURATA, SHIGEAKIIMANISHI, MASAHIROTAMURA, YOSHIHISA
Owner TOYOTA JIDOSHA KK